Ijviproveiviemt in grimdiwg-ivlllls



'UnrTrin STaTns TTTTTTT @Triton IVILLIAM J. LANE AND JOHN (l. LANE, OF MILLER-OOK, NE W YORK.

IMPROVEMENT' IN GRINDlNG-'vllLt Speciication forming part of Letters Patent No. 152,655, dated June 30, 1874; application tiled January G, 1873.

T0 all whom. it may concern Beit known that we, VILLIAM J. LANE and JOHN G. LANE, of Millbrook, in the county of Dutchess and State of New York, have invented certain new and useful Improvements in Coffee-Mills; and we hereby declare that the following is a full, clear, and exact descripinterlocking-teeth upon the two grinding-sunf'aces. Fig. 4L represents a modified view of a portion of the standard or frame 5 and Fig. 5 is a horizontal cross-section of the standard.

Grinding mills have usually been constructed with a frame, tripod, or other broad base for supporting the burrs. Incase apsingle standard has been used, the horizontal axle was supported entirely on one side of the perpendicular center of said standard, which is thus not well balanced, and therefore not easily preyented from rocking or shaking while grind- 1n g.

One object of our invention is to remedy this difficulty; and to this end our invention consists of an ovoid mill-standard having an interior spacefor the gearing and rims of metal on either side thereof, which support the horizontal axle on two bearings, one of which is on each side of the perpendicular center of said standards; and it also consists of other improvements, hereafter full y described and claimed.

In the accompanying drawings our iinproved mill-standard is shown in Fig. 1, at B, resting on a separate pedestal, A, to which it is connected by a screw-joint. The axle E is supported on two bcarin gs in the rim ofthe standard B, one of said bearings on each side of the perpendicular center of said standard, which is thus balanced, and therefore not so liable to tremble in grinding. The gear-wheels U and D are placed in the central space ofthe ovoid rim of the standard, nearly above the supporting-shank, resting upon the pedestal.

The two balance-wheels Gr and F are placed upon opposite sides of the standard, thus tending to keep the standard balanced; andthe back of the mill, the burrs or grinders, and the hopper, are all supported on the central neck of the standard, so as to equalize, as near as possible,` the weight on opposite sides. The back H of the mill is connected to the neck of the standard B by means of a 'smooth joint and set-screw, I, as shown in Fin: 3. The inner surface of this back is convex near the central shaft S, as seen in Fig. 3, so that the ground coffee has a tendency to fall downward and outward, away from the shaft, and pass freely out of the spout K. To facilitate the clearing ot' the mill, a sweep, L, is employed,V

the same being made to revolve with the runner It, by means of projection N. This sweep has anarrow flange, Z, upon which it rests and revolves easily without click or noise, which is very desirable. The hopper O and front or upper part of the mill O are cast in one piece. But the upper or stationary grinding-surface I is cast in a separate piece, and then fastened to the front of the mill by studbolts and nuts a, Fig. 3. By this arrangement the grinding-surfaces when worn may be easily and cheaply replaced, and the grinding-teeth are prevented from being thrown out of place by the shrinkage in cooling the cast-in gs. The runner R is also cast separately, and the shaft S driven into a taper hole bored into the runner; also, all the gear-wheels are cast separately. The shaft S is very short and stepped upon the bar T, which serves to adjust the shaft vertically, by means of screwbolts U and nuts V, for the purpose of regulatin g the fineness of the ground coifce. The upper and central portion ot' the runner is conical, and has the usual mill-dress intended for breaking the kernels of coii'ee. But the main portion of the ruimer has a horizontal grindin g-surface, which is providedwith what is known as the Swift mill-dress, the teeth being set in a series of circles ot' different diameters,

with grooves between the circles of teeth to receive the points of the teeth ofthe stationary grinder WV, which has a corresponding dress. Thus the teeth of the two opposing enin of teeth already described, the teeth are also set in obliquely radial rows but the relative position of the teeth in the different circles may be varied' without departing from the main feature of the Swift mill-dress.

In setting up the mill, itis necessary to have the circles of teeth in the stationary grinder perfectly concentric with the similar circles of teeth in the runner. Now, if the stationary grinder were cast in the same piece with the hopper and upper part of the mill, the shrinkage in cooling the castings would render the circles of teeth eccentric or untrue, and thus destroy the efficiency of the mill. But by casting the parts separately, as above described, we prevent these difficulties.

In putting the parts of the mill together, we rst secure the back H in position upon the standard. Then the runner is put into place, and the stationary grinding-plate placed upon the runner with the two sets of teeth interlocking, as seen in Fig. 3. The hopper and front are next placed upon the back and secured by bolts l?. Then, finally, the nuts a are turned home to fasten the stationary grinder in the position determined by the position of the runner and the interlocking teeth, the large holes for the bolts a allowing the stationary grinder to adjust itself' to the runner before being screwed up. A removable shelf, Y, supported by projections on the standard B, serves to hold the box to receive the ground coffee. Motion may be given to our mill by the cranks XV, or other suitable means.

The standard B is cast with ribs, as seen in Fig. 5, which is a cross-section of said standard, in either the shank, neck, or one side of the rim of metal, in order to give greater strength without an increase of metal. The rim of the standard may be circular, as seen in Fig. 4, or of any other suitable form, for one of which forms we are seeking a separate patent for a design which is not herein claimed.

Having thus fully described our invention, we claiml. The above-described ovoid mill-standard, having a rim with two bearings for the axle E, and a central space for the gear-wheels, substantially as and for the purposes set forth.

2. In combination with the back of the mill, the sweep L, provided with the narrow flan ge l, substantially as and for the purposes set forth.

WILLIAM J. LANE. JOHN G. LANE.

Witnesses z J AooB DEUEL, JOSEPH DUBOIS. 

